Entities

entities/hatch/edge

#include "dxfio/entities/hatch/edge.hpp"

In DxfIO::Entities::Edges

struct Node

A vertex of a polyline boundary, or a control point of a spline edge, with its bulge or weight.

Field	Type	Meaning
`Position`	`Vector`	The location, in the hatch's own coordinate system. Groups 10, 20.
`Weight`	`std::optional<double>`	The bulge of the segment to the next vertex, or the weight of the control point, when it has one. Group 42.

struct Place

A point of a hatch: a seed point, or a fit point of a spline edge.

Field	Type	Meaning
`Position`	`Vector`	The location, in the hatch's own coordinate system. Groups 10, 20 for a seed point, 11, 21 for a fit point.

struct LineLINE

A straight edge of a hatch boundary.

Field	Type	Meaning
`Start`	`Vector`	The start point, in the hatch's own coordinate system. Groups 10, 20.
`End`	`Vector`	The end point, in the hatch's own coordinate system. Groups 11, 21.

struct ArcARC

A circular arc edge of a hatch boundary.

Field	Type	Meaning
`Center`	`Vector`	The center, in the hatch's own coordinate system. Groups 10, 20.
`Radius`	`double`	The radius, in drawing units. Group 40.
`Start`	`double`	The start angle, in degrees. Group 50.
`End`	`double`	The end angle, in degrees. Group 51.
`Counter`	`int`	1 when the arc runs counterclockwise. Group 73.

struct EllipseELLIPSE

An elliptic arc edge of a hatch boundary.

Field	Type	Meaning
`Center`	`Vector`	The center, in the hatch's own coordinate system. Groups 10, 20.
`Major`	`Vector`	The end of the major axis, relative to the center. Groups 11, 21.
`Ratio`	`double`	The length of the minor axis over that of the major axis. Group 40.
`Start`	`double`	The start angle, in degrees. Group 50.
`End`	`double`	The end angle, in degrees. Group 51.
`Counter`	`int`	1 when the arc runs counterclockwise. Group 73.

struct SplineSPLINE

A spline edge of a hatch boundary.

Field	Type and default	Meaning
`Degree`	`int{3}`	The degree of the spline, 3 for a new one. Group 94.
`Rational`	`int`	1 when the spline is rational. Group 73.
`Periodic`	`int`	1 when the spline is periodic. Group 74.
`Knots`	`std::vector<double>`	The knot values; group 95 counts them. Group 40.
`Poles`	`std::vector<Node>`	The control points, with their weights when the spline is rational; group 96 counts them.
`Fits`	`std::vector<Place>`	The points the spline passes through; group 97 counts them. From R2010.
`Start`	`Vector`	The tangent at the start, when the spline has fit points. Groups 12, 22, from R2010.
`End`	`Vector`	The tangent at the end, when the spline has fit points. Groups 13, 23, from R2010.

using Edge

An edge of a hatch boundary, its kind given by group 72: 1 line, 2 circular arc, 3 elliptic arc, 4 spline. A spline is kept on the heap, so an edge stays the size of an elliptic arc.

using Edge = std::variant<Line, Arc, Ellipse, Boxed<Spline>>;